<template>
    <div class="app-container">
  
      <!-- 查询表单 -->
      <el-form :inline="true" class="demo-form-inline">
        <el-form-item>
          <el-input v-model="courseQuery.title" placeholder="课程名称" />
        </el-form-item>
  
        <el-form-item>
          <el-select v-model="courseQuery.status" clearable placeholder="课程状态">
            <el-option :value="'Normal'" label="已发布"/>
            <el-option :value="'Draft'" label="未发布"/>
          </el-select>
        </el-form-item>
  
        <el-form-item>
          <el-input v-model="courseQuery.low" placeholder="最低价格" />
        </el-form-item>
        <el-form-item>
          <el-input v-model="courseQuery.high" placeholder="最低价格" />
        </el-form-item>
  
        <el-button type="primary" icon="el-icon-search" @click="getList()">查询</el-button>
        <el-button type="default" @click="resetData()">清空</el-button>
      </el-form>
  
      <!-- 表格 -->
      <el-table :data="list" element-loading-text="数据加载中" border fit highlight-current-row>
  
        <el-table-column label="序号" width="70" align="center">
          <template slot-scope="scope">
            {{ scope.$index + 1 }}
          </template>
        </el-table-column>
  
        <el-table-column prop="title" label="课程名称" width="80" />
  
        <el-table-column label="课程状态" width="80">
          <template slot-scope="scope">
            {{ scope.row.status === 'Normal' ? '已发布' : '未发布' }}
          </template>
        </el-table-column>
  
        <el-table-column prop="lessonNum" label="课时数" />
  
        <el-table-column prop="gmtCreate" label="添加时间" width="160" />
  
        <el-table-column prop="viewCount" label="浏览数量" width="80" />
  
        <el-table-column label="操作" width="450" align="center">
  
          <template slot-scope="scope">
            <router-link :to="'/course/info/' + scope.row.id">
              <el-button type="primary" size="mini" icon="el-icon-edit">编辑课程基本信息</el-button>
            </router-link>
  
            <router-link :to="'/course/chapter/' + scope.row.id">
              <el-button type="primary" size="mini" icon="el-icon-edit">编辑课程大纲</el-button>
            </router-link>
  
            <el-button
              type="danger"
              size="mini"
              icon="el-icon-delete"
              @click="deleteCourse(scope.row.id)">删除课程信息</el-button>
          </template>
        </el-table-column>
      </el-table>
  
      <!-- 分页 -->
      <el-pagination
        :current-page="page"
        :page-size="limit"
        :total="total"
        style="padding: 30px 0; text-align: center;"
        background
        layout="total, prev, pager, next, jumper"
        @current-change="getList"
      />
    </div>
  </template>
  
  <script>
  // 引入course.js文件
  import course from '@/api/edu/course'
  
  export default {
    data() { // 定义变量和初始值
      return {
        list: [], // 查询之后接口返回的数据赋值给list
        page: 1,
        limit: 3,
        total: 0,
        courseQuery: {}
  
      }
    },
    created() { // 页面渲染之前执行,一般用来调用methods中定义的方法
      // 调用
      this.getList()
    },
    methods: { // 创建具体的方法,调用course.js中定义的方法
  
      // 根据课程id删除课程
      deleteCourse(courseId) {
        this.$confirm('此操作将永久删除课程记录, 是否继续?', '提示', {
          confirmButtonText: '确定',
          cancelButtonText: '取消',
          type: 'warning'
        }).then(() => {
          course.deleteCourseById(courseId)
            .then(response => {
              // 1.提示删除成功
              this.$message({
                type: 'success',
                message: '删除成功!'
              })
              // 2.回到列表页面
              this.getList()
            })
            // eslint-disable-next-line handle-callback-err
            .catch(error => { }) // 删除失败
        })
      },
      getList(page = 1) {
        this.page = page
        course.getListCourse(this.page, this.limit, this.courseQuery)
          .then(response => {
            this.list = response.data.rows
            this.total = response.data.total
          })
          .catch(error => {
            console.log(error)
          })
      },
      // "清空"的方法
      resetData() {
        // 1.表单输入项数据清空
        this.courseQuery = {}
  
        // 2.查询所有讲师数据
        this.getList()
      }
    }
  }
  </script>
  